<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .red {
      color: red;
    }
    .green {
      color: green;
    }
  </style>
</head>
<body>

<div id="app"></div>

<script src="main.js" type="module"></script>

</body>
</html>
